About three quarters of the time when I go from a sitting or laying position to standing, I get a headrush. My vision looks like a snowy television screen on a disconnected channel and I can't seem to stand or think straight for a few seconds.
Your blood pressure is dipping. This is very common especially among younger people. Try and get up more slowly and you will find you do better. It is scary, I know, but it is not abnormal.
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